A novel Ag(I)-catalyzed benzylic amination reaction with in situ generation of NH-1,2,3-triazoles for N2-substituted 1,2,3-triazole scaffolds is described. This protocol is achieved with easily accessible substrate, broad functional group, good regioselectivity, thus providing the efficient and practical method to diverse N2-substituted 1,2,3-triazole rings with moderate to good yields.
Copper-Catalyzed Radical Bis(trifluoromethylation) of Alkynes and 1,3-Enynes
作者:Haigen Shen、Hawen Xiao、Lin Zhu、Chaozhong Li
DOI:10.1055/s-0039-1690187
日期:2020.1
The copper-catalyzed radical bis(trifluoromethylation) of alkynes and 1,3-enynes is described. With Cu(CH3CN)4BF4 as the catalyst, the reaction of arylalkynes with Togni reagent II and (bpy)Zn(CF3)2at roomtemperature affords the corresponding 1,2-bis(trifluoromethylated) alkenes in good yields with excellent E-stereoselectivity. Under similar conditions, the reaction of 1,3-enynes provides the corresponding
Selective Fluoromethyl Couplings of Alkynes via Nickel Catalysis
作者:Huan Li、Fang Wang、Shengqing Zhu、Lingling Chu
DOI:10.1002/anie.202116725
日期:2022.2.21
A nickel-catalyzedthree-component carbo-fluoromethylation of alkynes with aliphatic halides and BrCF2H or ICH2F in the presence of zinc is described. This process is based on a nickel-mediated radical addition/fluoromethyl coupling domino strategy and provides selective access to a diverse range of biologically valuable CF2H- and CH2F-substituted alkenes with excellent regio- and stereoselectivity
描述了在锌存在下,炔烃与脂肪族卤化物和 BrCF 2 H 或 ICH 2 F 的镍催化三组分碳氟甲基化反应。该过程基于镍介导的自由基加成/氟甲基偶联多米诺策略,并提供对具有优异区域选择性和立体选择性的多种具有生物价值的 CF 2 H-和 CH 2 F-取代烯烃的选择性访问。
Fluorescent Oligonucleotides Containing a 2-Ethynylfluorene- or 2-Ethynylfluorenone-labeled 2′-Deoxyguanosine Unit: Fluorescence Changes upon Duplex Formation
作者:Min Ji Kim、Gil Tae Hwang
DOI:10.1002/bkcs.10856
日期:2016.8
Two new DNA probes bearing a fluorescent deoxyguanosine unit labeled with 2‐ethynylfluorene (GFL) or 2‐ethynylfluorenone (GFO) were synthesized and examined for their efficiency as quencher‐free linear beacon probes. Oligodeoxynucleotides (ODNs) containing a GFL or GFO unit exhibit low thermal selectivity and few distinctive fluorescence changes upon duplex formation due to the syn conformation about
Copper-catalyzed C(sp)–H aryl amination enables modular synthesis of quinolines and 2-quinolinones
作者:Yang Gao、Haixia Li、Simin Yang、Yanping Huo、Qian Chen、Xianwei Li、Zhe Wang、Xiao-Qiang Hu
DOI:10.1007/s11426-023-1739-y
日期:2024.2
Herein, we disclose a novel copper-catalyzed C(sp)–H aryl amination of terminal alkynes with anthranils, enabling the rapid generation of highly reactive secondary N-aryl ynamines for the modular synthesis of structurally diverse C2-substituted quinolines and 2-quinolinones. The in-situ formed carbonyl-ynamines are prone to tautomerize to carbonyl-ketenimines, which can efficiently react with a series
在此,我们公开了一种新型的铜催化末端炔烃与邻氨基苯酚的C(sp)-H芳基胺化反应,能够快速生成高反应性仲N-芳基炔胺,用于结构多样的C2取代喹啉和2-喹啉酮的模块化合成。原位形成的羰基烯胺易于互变异构为羰基烯酮亚胺,可与一系列亲核试剂,包括胺、醇、酚、硫醇、苯硫酚、活性亚甲基化合物,甚至水有效反应,生成各种喹啉衍生物,产生 H 2 O 作为唯一的绿色副产品。该方法还开辟了创建各种喹啉稠合杂环的实用途径,并可成功应用于复杂分子的后期修饰和生物活性靶标的简洁合成。机理研究揭示了使用邻氨基苯甲醚作为新型芳基氮烯前体的铜催化内球氮烯转移过程。